It's quickly getting crowded in the Democratic primary to replace Pennsylvania Rep. Allyson Y. Schwartz — and she hasn't even officially announced her campaign for governor yet.

But state Rep. Brendan Boyle announced his candidacy for her House seat on Monday, according to The Philadelphia Inquirer.

He joins at least two other Democrats already running for the 13th District in suburban Philadelphia: Valerie A. Arkoosh, a medical professor at the University of Pennsylvania, and state Sen. Daylin Leach previously announced their campaigns.

State Sen. Michael Stack, Montgomery County Commissioner Josh Shapiro and former City Controller Jonathan Saidel are also believed to be looking at the race.

Schwartz has indicated she will run for governor but has yet to formally announce her bid. The 13th District consistently votes for Democrats, and the primary winner will come to Congress in all likelihood.